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Found a C5, possible issue with fuel/air mixture - need advice

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Corvette >> Corvette Models >> Corvette C5 Forum >> Found a C5, possible issue with fuel/air mixture - need advice

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Found a C5, possible issue with fuel/air mixture - nee... - 8/10/2008 7:47:45 AM

boomie

Posts: 8
Joined: 8/10/2008
Status: offline

Hello folks,

Buying my first corvette and found a very nice 2002 coupe. The owner has installed a cold air intake system, long tube headers,a Corsa Indy exhaust system. He has not gotten a full tune up done after installing the above, but the shop put it on a dyno, tweaked the fuel/air mixture and said that was enough. I looked at the charts and it shows that the fuel/air graph is kinda haphazard and wavy and not smooth. The owner says that the measuring things was maybe not inserted properly. Thecar is otherwise very very meticulously been mantained.

my questions are:

Is this possible?
Would this have caused and long term damage?
How much does a full engine tune up cost?

Really appreciate your time helping me out. My fingers are crosed and hopefullythis car will work out.

Thanks
Boomie

Post #: 1

RE: Found a C5, possible issue with fuel/air mixture -... - 8/10/2008 4:16:15 PM

Lee Willis

Posts: 1953
Joined: 7/27/2005
Status: online

Yes it is possible. If the engine runs really lean it could hurt durability but that is doubtful. Does it throw codes? If so, then it is out of range, otherwise the waveness as a function of RPM is not too serious. Drive it, from dead cold (sitting overnight) with it in a condition that the check engine light is off (i.e., all codes cleared), if it warms up fully and you drive it softly and hard and lug it near idle to run it flat out to full RPM and let it really work out, and it throws no codes, it is okay.

_____________________________

2007 Aston Martin Vantage Prodrive
Lincoln MKZ "Grandfather car"
''98 Z28 with iron LS 408, NOS, tricks, street driven mid 9s (sold to my youngest son for $1, Aug 28, ''07)
''02 SCd 427 cid ZO6, 704 RWHP, sold Aug. 28, ''07

(in reply to boomie)

Post #: 2

RE: Found a C5, possible issue with fuel/air mixture -... - 8/13/2008 7:54:06 PM

Dave01

Posts: 675
Joined: 9/24/2005
Status: offline

A dyno-tune is typically $400-$600. Save your pennies!

_____________________________

2001 MN6 Coupe, all options
Halltech Stinger-R intake w/cold air mod - see
www.conceptualpolymer.com (Corvette Corner)
BPP shifter w/glass elegance shift knob
Borla Stinger quad round exhaust
Goodyear GSD3s

(in reply to boomie)

Post #: 3